Django SESSION_COOKIE_NAME ignored in Request

I have changed my SESSION_COOKIE_NAME value in my settings and restarted my webserver, unfortunately it still asks for the default 'sessonid' in the http requests - though the browser already sends the updated version. Therefore there is no match and a user cannot login.

Is there any reason why this is the case ?

I am using Django 1.8 and the default session manager (DB)